cannot build zephyr bluetooth tests in nrf-sdk

[pquevedo]

Following the installation guide for the latest nrf-connect sdk (v2.5.2) I am unable to run the zephyr bsim unit tests for the bluetooth mesh stack

#!/bin/bash
export BSIM_OUT_PATH=$HOME/dev/nrf-connect-sdk/tools/bsim/
export BSIM_COMPONENTS_PATH=${BSIM_OUT_PATH}/components

export WORK_DIR=${ZEPHYR_BASE}/bsim_out
export RESULTS_FILE=${ZEPHYR_BASE}/myresults.xml
export SEARCH_PATH=${ZEPHYR_BASE}/tests/bsim/bluetooth/mesh

${ZEPHYR_BASE}/tests/bsim/bluetooth/mesh/compile.sh

I am following the Readme on how to run these tests

- github.com/.../README.md

I have built and installed babblesim and set the correct paths. It fails with a linking error.

/usr/bin/ld.bfd: cannot find -lSOFTDEVICE_CONTROLLER_LIB_DIR-NOTFOUND/libsoftdevice_controller_multirole.a: No such file or directory
/usr/bin/ld.bfd: cannot find -lMPSL_LIB_DIR-NOTFOUND/libmpsl.a: No such file or directory
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

If I do the same thing from the standard zephyr repo (v3.5) it works without issue. So I don't think its something with my setup? 

[Hung Bui]

Hi pquevedo, 

It seems that the compiler couldn't find the binary libraries: libsoftdevice_controller_multirole.a , libmpsl.a. 
You can find  libsoftdevice_controller_multirole.a in \nrfxlib\softdevice_controller\lib\cortex-m4
And libmpsl.a in \nrfxlib\mpsl\lib\cortex-m4. 
YOu would need to select the library folder that match with your chip floating point configuration. Then you include in the project configuration the CONFIG_SOFTDEVICE_CONTROLLER_LIB_DIR and CONFIG_MPSL_LIB_DIR that point to the right folder. 

The reason you don't have an issue with Zephyr controller is that Zephyr controller doesn't use MPSL or Softdevice controller library. 

[pquevedo]

These are unit-tests running on babblesim (posix environment). There is no physical target.

Is the nrf52_bsim board not supported in the nrf-sdk then?

[Hung Bui]

Hi,

I'm not so familiar with the unit test. But even for simulation, you still need to include the library for it to compile. So you would need to choose one of the folders. 

[pquevedo]

Found out via discord that you have to explicitly define `CONFIG_BT_LL_SW_SPLIT=y` in the file `zephyr/tests/bsim/bluetooth/mesh/prj.conf` to get this to work. Appears nrf-sdk defaults to the nordic softdevice and you to have to override it or something...

Also this: devzone.nordicsemi.com/.../using-babblesim-with-softdevice-controller